Citation: Nian Lei, Zhili Miao, Fei Liu, Hua Wang, Xiaoli Pan, Aiqin Wang, Tao Zhang. Understanding the deactivation behavior of Pt/WO₃/Al₂O₃ catalyst in the glycerol hydrogenolysis reaction[J]. Chinese Journal of Catalysis, ;2020, 41(8): 1261-1267. doi: 10.1016/S1872-2067(20)63549-5 shu

Understanding the deactivation behavior of Pt/WO₃/Al₂O₃ catalyst in the glycerol hydrogenolysis reaction

Nian Lei ^a,b, ,
Zhili Miao ^a ,
Fei Liu ^a ,
Hua Wang ^a ,
Xiaoli Pan ^a ,
Aiqin Wang ^a ,
Tao Zhang ^a

a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, PR China

Received Date: 15 November 2019
Revised Date: 19 December 2019

Fund Project: This work was supported by the National Key Projects for Fundamental Research and Development of China (2018YFB1501600), the National Natural Science Foundation of China (21690080, 21690084, 21721004, 21673228), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17020100), DNL Cooperation Fund (DNL180303), CAS and DICP ZZBS 201612.

The selective hydrogenolysis of glycerol to 1,3-propanediol is a highly important reaction for both improving the profitability of biodiesel and valorization of biomass. While intensive research efforts have been devoted to enhancing the catalytic activity and selectivity, little is focused on the stability although the latter is of paramount importance to practical applications. In this work, we investigated the stability of Pt/WO₃/Al₂O₃ and observed a continuous deactivation trend during a 700 h time-on-stream run. Neither the leaching of active W nor the coking was responsible for the deactivation. Instead, XRD, HAADF-STEM and CO chemisorption results clearly showed the occurrence of significant aggregation of Pt particles, which caused a remarkable decrease of Pt-WO_x interfacial sites. As a consequence, strong Brönsted acid sites which were in situ formed by H₂ dissociation at the Pt-WO_x interfacial sites were reduced, leading to the deactivation of the catalyst.
- Glycerol,
- Hydrogenolysis,
- 1,3-propanediol,
- Deactivation,
- Aggregation/agglomeration
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Understanding the deactivation behavior of Pt/WO₃/Al₂O₃ catalyst in the glycerol hydrogenolysis reaction